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The cyclic oxidation behavior of fourth-generation nickel-based single crystal superalloys with 2–4 wt% Mo content were studied at 900 ℃ and 1100 ℃. At 900 ℃, with the increase of Mo content, the oxide layer accumulates more growth stress, resulting in the interface between the outer oxide layer and the inner oxide layer more prone to crack initiation. At 1100 ℃, the oxidation layer accumulates more growth stress and thermal stress, so the oxidation layer occurs large scale spalling, which is more severe in 4Mo alloy. The results show that the increase of Mo content of alloy promotes the oxidation of containing W-Re alloy, which promotes the volatilization of oxides and the spalling of oxide, decreases the protection of oxide layer, and deteriorates the oxidation resistance of the alloy. • The increase of Mo content of alloy promotes the oxidation of containing W-Re alloy. • With the increase of Mo content, the volatilization of oxides and the spalling of oxide of alloy was promoted. • Mo has more severe harm to the oxidation resistance of the alloy at higher temperature. • The alloy with 2 wt% Mo addition has the highest oxidation resistance. [ABSTRACT FROM AUTHOR]